Form for floors



July 6,1926. 1,591,711

T. H. KANE--\ FORM FOR FLOORS 1 Filed April 4, 1922 Patented July 6, 1926.

UNITED STATES PATENT OFFICE.

THOMAS H. KANE, F YOUNGSTOWN, OHIO, ASSIGNOR TO TRUSOON STEEL COMPANY, OF YOUNGSTOWN, OHIO, A CORPORATION OF MICHIGAN.

FORM FOR FLOORS.

Ap'plication filed April 24, 1922. Serial No. 556,243.

The forms constituting the subject matter of this application are intended to produce air spaces in concrete slabs and are usually placed end to end in parallel rows with concrete above and between them.

In my prior Patent No. 1,065,449, dated June 2 1, 1913, a form for floors is shown of open box-like shape in which the top has a plurality of main depending transverse ribs and a series of secondary ribs between the main ribs and at substantially right angles thereto. These forms have generally been found satisfactory, but in some cases, as where the form is to support a heavy dead load before the concrete has set, these patented forms are not sufficiently stiff, and the present invention has for its object the production of a form which shall embody no more material than do the patented forms of the same general dimensions, but which shall be capable of carrying a much heavier load with the same deflection.

In the accompanying drawing, Fig. 1 is a diagram showing the original corrugations of the top of this sheet metal form in dotted lines and the deep ribs formed therein which are to give this form sufficient strength. Fig. 2 is a plan of a completed form. Figs. 3 and 41 are sections on the lines 33 and 4.4l of Fig. 2 respectively.

Similar reference characters refer to like parts throughout the several views.

The form shown in the drawing is produced from a sheet 1 of corrugated material,

the original corrugations being transverse to the sheet as indicated at 2 in the several figures. The sheet is bent twice along lines at substantially right angles to the corrugations, the bends 3 being gradual. The

sides 4 of the form may be at any desired angle to the top but I prefer them to be approximately at right angles thereto.

At the time the sheet is bent, the metal which is to constitute the top of the sheet metal form is pressed between dies to produce a series of parallel corrugations or grooves, one corrugation or groove across the top for every two corrugations of the original sheet, the sides of adjacent grooves being united to each other and to the sides of adjacent corrugations by means of substantially cylindrical strips extending parallel to the grooves. The two sides of adjacent corrugations and the cylindrical strip uniting them form a rib 5, and as all the material of the top 6 is used in producing these ribs 5, the stiffness of the finished form is much greater than that shown in the prior patent. is

Fig. 4- shows the ends 7 of the ribs 5 to be of less depth than the middle, but the depth there shown is sufficient as these points are so near the supporting side walls l. This construction also permits these forms to be bent along the lines 3 so that the sides may be at any desired angle to the tops and the lower edges of these sides may be moved toward and from each other to produce the desired air spaces and serve as proper molds for the concrete beams which are to extend between adjacent rows of these forms.

The sizes and proportions of these forms and the spacing and depths of the ribs and corrugations therein may all be changed by those skilled in the art without departing from the spirit of my invention as set forth in the following claims.

I claim 1. A sheet metal form of open box-like shape for producing air spaces in floor slabs, comprising a top and sides integral therewith, said sides having substantially evenly spaced vertical corrugations, the top having evenly spaced transverse corrugations less numerous and deeper than the corrugations of the sides, the corrugations of the top comprising substantially flat sides at an angle to each other integrally connected to each other and to the sides of adjacent corrugations by means of substantially cylindrical strips parallel to said corrugations of the top.

2. A sheet metal form of open box-like shape for producing air spaces in concrete slabs, comprising a top and sides integral therewith, said sides being formed with substantially evenly spaced vertical corrugations, the top being formed with transverse grooves less numerous than the corrugations of the sides, the sides of adjacent grooves being united by means of substantially cylindrical strips extending parallel to the grooves.

THOMAS H. KANE. 

